Yazar "Köysüren H.N." seçeneğine göre listele

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  • Küçük Resim Yok
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    The removal of heavy metal ions from the aquatic environment by modified apricot kernel shells [Sucul ortamdan a?ir metal iyonlarinin modifiye edilmiş kayisi çekirdegcaron;i kabugcaron;u ile giderimi]
    (2013) Köysüren H.N.; Dursun S.
    The removal of Ni(II) and Cr(VI) ions from aqueous solutions using chemically modified apricot kernel shells (P. armeniaca L.) was investigated in this research. Chemical modification methods effects on the adsorption capacity improvement for removal of heavy metals have been investigated. Structures of apricot kernel shells materials before and after modifications was examined by the FTIR and SEM analyses. HCl, NaOH and Fenton reactives were used for the modification processes. The investigation of kinetic, isotherm and thermodynamic parameters were also studied for HCl, NaOH and Fenton modified apricot kernel shells The rejeneration processes were studied for the determination of apricot kernel shells' reusability after the adsorption processes. Additional costs for applied modification processes were calculated and they were compared with the classical methods. The chemical oxygen demand (COD) residues in treated water by raw apricot kernel shells materials decreased from 910-1430 mg/L to 10-90 mg/L with the modification processes. The removal efficiencies changed with heavy metal concentration in water sample and increased up to 92% for apricot kernel shells materials. The adsorption capacities were found between 1 mg/g and 90 mg/g according to type of adsorbent and modification methods. As a result, it was revealed that adsorption capacities and costs of apricot kernel shells were compatible with conventional adsorbents.
  • Küçük Resim Yok
    Öğe
    The removal of lead and nickel ions from the water with Verbascum cheiranthifolium l. material [Sudan kurşun ve nikel iyonlarinin verbascum cheiranthifolium l. materyali ile giderimi]
    (Gazi Universitesi Muhendislik-Mimarlik, 2014) Dursun Ş.; Köysüren H.N.
    In this research, removal Pb(II) and Ni(II) ions from aqueous solutions by modified mullein (Verbascum cheiranthifolium BOISS. var. cheiranthifolium) plant material was investigated. Effects of modification method on the adsorption capacity improvement for removal of these heavy metals ions have been investigated. Structures of modified mullein plant materials before and after modifications process were examined by the FTIR and SEM analyses. Modification processes were performed using HC1 acid solutions. The investigations of kinetic, isotherm and thermodynamic parameters were also studied for HC1 modified mullein plant material. The regeneration processes were studied for the determination of modified mullein plant material's reusability after the adsorption processes. Additional costs for applied modification processes were calculated and compared with the other classical methods. The chemical oxygen demand residues in treated water by modified mullein plant material comparing raw materials were decreased from 910-1430 mg/L to 10-90 mg/L with the modification processes. The removal efficiencies changed with heavy metal concentration in water sample and increased about 70% for modified mullein plant material. Heavy metal adsorption capacities were found maximum about 90 mg/g according to type of adsorbent and modification process. As a result, it was revealed that adsorption capacities and costs efficiency of adsorbent were compatible with conventional adsorbents.